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Prior to purchasing these, my primary concern is to have a proper alternative for my ESW9 which have better isolation to be used for listening to my ballad tunes on the road. While I don't have any issues with louder tracks, with more subtle ones, my ESW9 aren't up to the task, and so my search began. Actually, I'm not really keen on the idea of using an IEM since they irritate my ears...” --lotusbloom

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The Ortofon e-Q5 is an easy-to-drive low impedance single balanced armature driver designed by Ortofon themselves. It uses OFC cables and the shells are aluminium CNC-ed.
As with most Japanese products, presentation is important and the e-Q5 doesn't disappoint. It comes in a nice cylindrical can with a multitude of accessories - tip cleaner, flanges/tips of various sizes,...” --AnakChan

“This is in my humble oppinion the very best bang for your buck custom in ear monitor on the whole market. For 250 british pounds you get a very nice piece of equipment, from very nice people too! The guys at cosmic ears care about their stuff being done properly and on time, they checked everything to be correct, from my ear canal impressions to colour, logos, letters, etc. They also come with...” --ardacer

“First of all I'd like to say the customs and the cable are both insane, the customs look incredible and the linum cable and connector beat the hell out of any other CIEM I've seen around.
Cosmic Ears list this as a jack of all trades monitor which I do agree with. I'm coming from a 4BA model to this 2BA and I've been pleasantly surprised by the sound. I haven't had these a week yet so...” --daftpolecat

“First of all I'd like to say the customs and the cable are both insane, the customs look incredible and the linum cable and connector beat the hell out of any other CIEM I've seen around.
Cosmic Ears list this as a jack of all trades monitor which I do agree with. I'm coming for a 4BA model to this 2BA and I've been pleasantly surprised by the sound. I haven't had these a week yet so...” --daftpolecat

“Copied from: http://www.head-fi.org/t/686039/cosmic-ears-ba4f-review
I'm finding it hard to rate these, for the price I would give them 5 stars on every department. But I'd rather rate them, referenced with the idea of what the very best cIEM could be.
The BA4f with the Ice Blue color
Short History
Before I started my journey into the cIEM...” --Marleybob217

“The HY3 is a three-way, three-driver hybrid custom in-ear monitor from Sweden-based Cosmic Ears. It utilizes a dynamic driver for the bass and twin balanced armature drivers for the midrange and treble, which used to be a very rare configuration, although hybrids have increased in popularity over the past year. The bass unit looks to be around 8mm in diameter and has its own sound bore. The two...” --blueangel2323

The HY2 combines a dynamic driver for lows and a balanced armature for the mids and highs. This dynamic driver also delivers an increased soundstage. The HY2 is a great sounding monitor for those looking for something a little different by combing the 2 driver technologies.
Twin hybrid – 1 for lows, 1 for mids and highs
Full sized medical grade hard acrylic shell
Various...